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A comment on Ask HN: How has Facebook figured out my family doctor as a friend suggestion?. Parent comment

Re:Ask HN: How has Facebook figured out my family doctor as ... by williamscales on Sunday April 16, 2017 @01:17PM (#14126490)
I think the original asker said he had never uploaded his contacts. Presumably though Facebook could just follow the reverse relation from the doctor without needing to confirm that it goes both ways.
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Re:Ask HN: How has Facebook figured out my family doctor as ... by throwaway_374 on Tuesday April 18, 2017 @05:42AM (#14137466)
Thanks for reading my post and noting this. I'm not sure the reverse relation applies either as it would require the doctor to have my personal contact on her mobile which is absolutely not the case as this is a shared practice and I haven't been to her in years.
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Re:Ask HN: How has Facebook figured out my family doctor as ... by compsciphd on Friday April 21, 2017 @05:37AM (#14164162)
the asker doesn't have to upload his contacts, he just has to tell facebook his number or email address. the doctor might have uploaded his contacts which include one of those pieces of information.
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